WEST HOLLYWOOD. A little less congested than Melrose (its high-profile neighbor to the east), Robertson Boulevard gives no ground when it comes to things trendy. Between Beverly Boulevard and Third Street, this collection of stores and galleries includes the hip likes of Madison, Curve, Lisa Kline, and Nanette Lepore. In addition (and perhaps not as well known), antique hounds find much to their liking at places like the Collection, Indigo Seas, Japanache, and Gazebo Antiques. Celebrity sightings are common.